update proxy of release-5.4 to raftstore-proxy-5.4 by proxy pr 179

[CalvinNeo]

What problem does this PR solve?

Issue Number: close #6131 ref #4982

Problem Summary:
update proxy to raftstore-proxy-5.4
Proxy PR:
pingcap/tidb-engine-ext#179
Including:\nSubmodule contrib/tiflash-proxy 5b31392a6..c15322fd6:

Fix cargo.lock in 5.4 (#179)

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• JaySon-Huang
• Lloyd-Pottiger

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[JaySon-Huang]

/merge

[ti-chi-bot]

@JaySon-Huang: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

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This pull request has been accepted and is ready to merge.

Commit hash: 34dbd9a

[CalvinNeo]

/merge

[ti-chi-bot]

@CalvinNeo: It seems you want to merge this PR, I will help you trigger all the tests:

/run-all-tests

You only need to trigger /merge once, and if the CI test fails, you just re-trigger the test that failed and the bot will merge the PR for you after the CI passes.

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[CalvinNeo]

/run-unit-test